Pulverizing-mill.



Nn. 683,256. Patented Sept. 24, ISDI.

J. W. DBUITT.

PULVERIZING MILL.

(Application led July 14, 1900.) (No Model.) 3 Sheets--Sheet I.

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No. 683,256. Patented sept. 24, |901.

J. W. DRUITT.

PULVERIZING MILL.

(Application led July 14, 1900.)

(No Model.) sheets-shex 2.

TME Nums suns co.. mmourno.. wAsHluuToN. rsA c No. 683,256. 'Patentedsep't. 24, |901.

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PULVERIZING IMLL.

` (Appliceion and .my 14, 1900.)

(no Mmm.) 3 sheets-sheet 3.

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" www UNITED STATES PATENT OEErcE.

JAMES W'ARREN DRUITT, OF OAKPARK, ILLINOIS.

`PULVERIZING-NIILL.

SPECIFICATION forming part of Letters Patent No. 683,256, datedSeptember 24, V1901.

Application filed July 14, 1900. Serial No. 23,633. (No model.)

To a/ZZ whom it may concern:

Be it known that LJAMES WARREN DRUITT,

a citizen of the United States, residing at Oakpark, in the county ofCook and State of Illinois, have invented a new and useful ImprovementinPulvcrizing-Mills, of which the following is a specification.

My invention relates particularly to machines for finely pulverizingcereals, granulated sugar, or other granular material.

` My object is to provide a machine of this character of simple andgenerally improved construction and perfectly adapted to 'perform itsfunctions. 1

In the accompanying drawings, Figure lis a plan View of my improvedmachine in its preferred form, a portion being broken away to show aneduction airvalve; Fig. 2, a broken plan view showing the constructionand arrangement of the beater-arms employed; Fig. 3, a transversevertical section at the corresponding line of Figs. l anda, and Fig. 4 alongitudinal vertical section at the corresponding line of Figs. l and3.

A represents a cylindrical casing having a fixed end A, a removable endA2, a removable hand-hole cover A3, and a base portion A4; B, a box-likepedestal or bin which supports the casing and to which the latter isrigidly fixed; C, a rotary beater-shaft journaled in bearings ot on thecasing ends; C', C2, C3, C4, and C5, beater-sections keyed at theircentral hub portions to the shaft; D,

adjustable collars fixed to the shaft by set-` screws and bearingagainst the inner surfaces of the casing ends; E, a cylindrical sieve orscreen supported upon flanges b on the inner surfaces of the casingcndsand concentric With the shaft; F, a feed-inlet guarded by a valve F',adj ustably fixed by a setscrevv c; G, an air-inlet pipe guarded by avalve G', and II an air-outlet pipe having a branch pipe H guarded by ahollow conical shield or defiector H2 and a manually-adjust able valveIIS, the pipe Il being continued past the branch pipe H and united withthe pipe Gto form a return-circuit for the pulverulent materialcollected by the device H2.

The deflector H2 is shown in cross-section in Fig. 1 and comprises aconcave disk having its concave surface turned inwardly, the disk beingof less diameter than the pipe in A3 is in place.

Which it is supported, thereby allowing the air t0 pass its periphery.

The part E comprises two perforated sections d and d', a connectingbinding-plate d2 andcoacting binding-strips d3, teeth or projections d4on the inner surface of the plate d2, and binding-platesfandf', providedwith outturned adjacent tianges f2, joined by bolts f3. The casing endA2 is secured by bolts g,

and it will be understood that the part E is firmly secured upon theflanges which support it by means of the boltsfs, after the internalparts are in place and before the cover p The platesfandf are providedon their inner surfaces with teeth or projections h, as shown.

Each beater section comprises, asl here shown, a hub and four radialbeater-arms of the form of frustums of cones, tapering out- Wardly, eacharm being supplied with crosslugs, as shown. The beater-sections are soarranged on the shaft that starting from the outer sections the sectionssuccessively lag behind as the center is approached. In other words, anygivenarm of the center section may be assumed as a base-arm, from whichproceed spiral Win gs extending in advance of (in the direction ofrotation) the base-arm, each wing comprising the successively-advancedcorresponding arms of the sections at one side of the central section.The teeth of the binding-plates are so disposed as to allow the ends ofthe beater-arms to pass between them, as appears from Fig. 4.

The cylindrical sieve E forms, with the cylindrical wall of the casing,an annular chan nel, through which the pulverized material passes toadischarge-passage 7o, leading to the receiving bin or box B. The bin isprovided with an extension I, having a removable cover, whereat thepulverized material may be removed.

In operation the beater-shaft is rotated at a very high rate of speed,and the disposition of the beater-arms at the feed end of the machine issuch as to draw the material into the machine and hurl it into the pathof the beater-arms at the opposite end of the machine, the latter armsin turn tending to return it to the center of the machine. Thus theparticles are hurled together and their reduction greatly facilitated bymutual attri- IOO tion. The tendency of all the arms is to hurl thematerial toward the. screen, and the beater as a whole acts as a fanwhich draws air in through the pipe G and employs it as a current forforcing the material through the screen and into the bin B. This currentof air serves to maintain a cool temperature Within the machine. Thepipe H leads from the bin extension I and air passes through the saidpipe, some escaping past the collecting device at H' and some beingrecirculated through the machine and serving to carry back the collectedmaterial. The relative proportions of recirculation and ot' circulationot' fresh cool air will be regulated by the valves G and H3. In thisconnection it is noteworthy that the ends ofthe casing A are 4dishedoutwardly, so that air-passages of conaccess to the interior of thescreen.

" siderable cross-section are afforded outside the end beater-sections.

Power may be applied to the beater-shaft in any suitable manner. In Fig.1 I have shown a pulley J, through the medium of which the shaft may berotated.

The feature of having one end of the casing removable and the screensupported as described is very important, as the changing of screens toregulate the tineness of pulverizing is thereby greatly facilitated. Thebolts j"3 at the end of the screen adjacent to the removable casing endmay be loosened,there by allowing the screen end toexpand, andthereafter the casing end can be removed for lVhen the screen is to bereplaced, it can be readily withdrawn in its annular from after firstloosening the bolts f3 at each end of the screen. v

Changes in details of construction Within the spirit `of my inventionmay be made.

What I claim as new, and desire to secure by Letters Patent, is

l. In a machine ofthe character described, the combination of acasinghaving ends provided on their inner surfaces with annularshoulders, one of said casing ends being removable, an annular screenhaving a longitudinal joint whereat the margins are detachablyconnected, said screen being secured to said shoulders and forming withthe inclosing Wall of the casing an annular space, a removablehand-plate for, the casing adja- Cent to said joint, and a rotary beaterwithin said screen, substantially as and for the purpose set forth.

2. In a machine of the character described, the combination of acylindrical casing having one integrally-formed end provided on itsinner surface with an annular shoulder, a

' removable end for the casing provided on its inner surface with anannular shoulder,an annularscreen havingalongitudinal joint Whereat themargins are detachably connected, said screen being Wrapped upon saidshoulders, bolt connection at the meeting margins of said screen, aremovable hand-hole cover applied to the cylindrical portion of thecasing adjacent to said joint, and a rotary beater Within the screen,substantially' as and for the purpose set forth.

3. In a machine of the character described, the combination of a casing,a screen supported between the ends thereof and forming with theinclosing-casing walls an annular chamber, and a rotary beater withinsaid screen, said beater being supplied with radial beater-arms arrangedin sets, each havingacentral arm and flanking arms arranged successivelyin advance of each other as the casing ends are approached, whereby thearms tend to hurl the material to the longitudinal center, substantiallyas and for the purpose set forth.

4. In a machine ofthe character described, the combination of a casing,a screen, a rotary beater, a feed-inlet, an air-inlet, a receptacle forthe finished pulverized material, an air-outlet connected with saidreceptacle, and a dust-collecting device at said outlet comprising acentrally-located outwardlyn dished disk of less diameter than theoutlet, substantially as and for the purpose set forth.

5. In a machine of the character described, the combination of a casing,a screen, a rotary beater, a feed-inlet, an air-inlet, a receptacle forthe nished pulverized material, an air-outlet connected'with saidreceptacle, a dust-collecting device at said outlet, and a return-pipeconnecting said outlet-pipe with said casing and serving to conduct airand carried-over material back to the machine, substantially as and forthe purpose set forth.

JAMES WARREN DRUITT.

In presence of- D. W. LEE, A. D. BACCI.

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